APA (7e ed.) Bronvermelding

Educational Testing Service. (2009). The Official guide to the TOEFL test (3rd ed.). McGraw-Hill.

Chicago (17e ed.) Bronvermelding

Educational Testing Service. The Official Guide to the TOEFL Test. 3rd ed. New York: McGraw-Hill, 2009.

MLA (9e ed.) Bronvermelding

Educational Testing Service. The Official Guide to the TOEFL Test. 3rd ed. McGraw-Hill, 2009.